linux-kernel - Re: 2.6.19 file content corruption on ext3

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Message-Id: <1166607554.3365.1354.camel@laptopd505.fenrus.org>
Date:	Wed, 20 Dec 2006 10:39:14 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Andrei Popa <andrei.popa@...eo.ro>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hugh@...itas.com>,
	Florian Weimer <fw@...eb.enyo.de>,
	Marc Haber <mh+linux-kernel@...schlus.de>,
	Martin Michlmayr <tbm@...ius.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: 2.6.19 file content corruption on ext3


> Hmm, should we not flush after clearing the dirty bit? That is, why does
> ptep_clear_flush_dirty() need a flush after clearing that bit? does it
> leak through in the tlb copy?

afaics you need to 
1) clear
2) flush 
3) check and go to 1) if needed

to be race free. 



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